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GPS Map 398???????help

FD.
in Bass Boats, Canoes, Kayaks and more

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I have a Garmin gps map 398 plotter/depth finder.  I came with built in US Inland Lakes.   While there is some detail, there is nowhere near the detail my buddy gets on his Lowrance.  It there a chip out their I can upgrade with or do I have to change units?

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